html - What is the purpose of this JavaScript code? -

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i poking around inspect element , came across this:

numberofdivstorandomdisplay = 10;  var cookiename = 'divramdomvaluecookie';  function displayrandomdiv() {     var r = math.ceil(math.random() * numberofdivstorandomdisplay);     if (numberofdivstorandomdisplay > 1) {         var ck = 0;         var cookiebegin = document.cookie.indexof(cookiename + "=");         if (cookiebegin > -1) {             cookiebegin += 1 + cookiename.length;             cookieend = document.cookie.indexof(";", cookiebegin);             if (cookieend < cookiebegin) {                 cookieend = document.cookie.length;             }             ck = parseint(document.cookie.substring(cookiebegin, cookieend));         }         while (r == ck) {             r = math.ceil(math.random() * numberofdivstorandomdisplay);         }         document.cookie = cookiename + "=" + r;     }     (var = 1; <= numberofdivstorandomdisplay; i++) {         document.getelementbyid("randomdiv" + i).style.display = "none";     }     document.getelementbyid("randomdiv" + r).style.display = "block"; } displayrandomdiv();

what purpose? curious, :)

this code assumes have div's id's "randomdiv1", "randomdiv2" etc.

it reads cookie named divramdomvaluecookie. if it's present, contains integer value id of div shown ("randomdiv" + value of cookie).

then, hide divs, , show 1 of divs, different div id stored in cookie. if cookie not present, display random div.

this script has hard-coded number of div's in numberofdivstorandomdisplay variable.


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